Question

Write the formulae for the following.
Copper(II) oxide

Answer 1

• A chemical formula is a representation of a substance's molecular composition in terms of the symbols for the elements that make up the molecule.
• Copper(II) oxide is a compound containing Copper as cation and Oxygen as anion with symbols and valencies $\mathrm{Cu}\mathrm{and}\mathrm{O}+2\mathrm{and}-2.$
• By the criss-cross method, $$\begin{gathered} \mathrm{Cu}\mathrm{O} \\ +2-2 \\ \overline{\mathrm{CuO}} \end{gathered}$$.
• The chemical formula of Copper(II) oxide is $\mathrm{CuO}$.